uart0_isr.c

一个用C语言控制的读写7022

//串口发送数据
#include "c8051.h"

extern bit chuankou_bz;
extern bit jieshu_bz;
//extern bit error_bz=0;
//bit jieshu_bz=0;
extern bit error_bz;
extern uchar pointer;
extern uchar  receive[COUNT1];
uchar txsjjs; 

void UART0_ISR (void) interrupt 4
{
  unsigned char astring;
     while(RI0==0);//串口接收标志位的软件清零//
      RI0=0; 
      astring=SBUF0;
	 // ES0=0;
	  if(pointer==0)
	    {if( astring==0x68&&chuankou_bz==0)
		 	{chuankou_bz=1;
              receive[pointer++]=astring;
			   txsjjs=100;  
		 	  }
		   else error_bz=1;
		  } 
	   else
		{if(chuankou_bz==1)
		  {if(pointer>9)
           {if(pointer==9+2+receive[9])
		      {	if(astring==0x16)
			      {	receive[pointer++]=astring;
				    jieshu_bz=1;
					 pointer=0;	                      //jieshu通讯
				   }
				else error_bz=1;
			   }
			else
			 {if(pointer>COUNT1)
			    {error_bz=1;
				 }
			  else receive[pointer++]=astring;
			 }
		    }
			else
			{ if(pointer==7)
			   {if(astring==0x68)
			      {receive[pointer++]=astring;
				   }
				else
				  {error_bz=1;
				  }
			   }
			  else 
			   {receive[pointer++]=astring;
			   }
			 }  
		   }
		  else error_bz=1;
		}


   if(error_bz==1)
	  { uchar j;
	   error_bz=0;
	   pointer=0;
	   chuankou_bz=0;
	   for(j=0;j<COUNT1;j++)
	    {
		receive[j]=0;
		 }
	    
	   }



   //if((astring==0x68)&&(chuankou_bz==0))
   //   {
	    
//		 chuankou_bz=1;//开始接收数据标志
//		 }
 //    receive[pointer++]=astring;  
//	 if(pointer==COUNT1)
//	  {
//      ES0=0;            //数据长度到了,表示可以结束了!
//	   }
 // ES0=1; 
}


 void RS485(void)
 {   uchar j;
    uchar i;
	uchar r[18]={0x68,0x90,0x78,0x56,0x00,0x00,0x00,0x68,0x81,0x06,0x43,0xc3,0x11,0x11,0x11,0x11,0xff,0x16};
 //	TXC=0;
   for(i=100;i>0;i--);
 //  while(pointer==COUNT1)
 //     {
	  
   //pointer=0;
   //chuankou_bz=0;
   TXC=1;
    ES0=0;
   for(i=100;i>0;i--);
   for(j=0;j<18;j++)
       {
       SBUF0=r[j];
       while(TI0==0);
       TI0=0;
	   }
   ES0=1; 
   TXC=0;                                                 //485通讯向外发送数据
//	 }
  }